Question bank5.1 Inheritance

5.1 Inheritance

In a species of gecko, allele $A\,$ gives mottled skin and is dominant to allele $a$ , which gives plain skin.

A breeding record lists the parents' genotypes as $Aa\,$ and $aa$ .

What percentage of their offspring is expected to have mottled skin?

[1]

$50%50\%$ , because the $A a$ parent passes on $A$ in half of its gametes.

$25%25\%$ , because one of the four possible offspring genotypes is $A a$ .

$0%0\%$ , because the $aa$ parent cannot pass on allele $A$ .

$100%100\%$ , because every offspring receives an allele from the $A a$ parent.

In a species of gecko, allele $A\,$ gives mottled skin and is dominant to allele $a$ , which gives plain skin.

A breeding record lists the parents' genotypes as $Aa\,$ and $aa$ .

What percentage of their offspring is expected to have mottled skin?

$50%50\%$ , because the $A a$ parent passes on $A$ in half of its gametes.

$25%25\%$ , because one of the four possible offspring genotypes is $A a$ .

$0%0\%$ , because the $aa$ parent cannot pass on allele $A$ .

$100%100\%$ , because every offspring receives an allele from the $A a$ parent.

5.1 Inheritance Questions